class Student:
    name = "Unknown"

def SetHeight(self,name):
    self.name = name
    print(self)

if __name__ =="__main__":
    stu1 = Student()
    stu2 = Student()
    print("Student.name: {}".format(Student.name))
    print("stu1.name: {},stu2.name: {}".format(stu1.name,stu2.name))
    stu1.name = '李明'
    Student.name = '未知'
    print("Student.name: {} stu1.name: {},stu2.name: {}".format(Student.name,stu1.name,stu2.name))